DrawImage function problem

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   Hello,

Using DrawImage/DrawScaledImage alter image resolution (any image format) in PDF (even using ImageHorizontalResolution & ImageVerticalResolution).

Do anyone have an idea to how avoid this?

Thanks,
alinux

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alinux Members Profile Find Members Posts Team Player Joined: 09 Dec 08 Location: France Status: Offline Points: 20	Post Options Post Reply Quote alinux Report Post Thanks(0) Quote Reply Topic: DrawImage function problem Posted: 07 Jun 12 at 9:08AM
	Hello, Using DrawImage/DrawScaledImage alter image resolution (any image format) in PDF (even using ImageHorizontalResolution & ImageVerticalResolution). Do anyone have an idea to how avoid this? Thanks, alinux

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 07 Jun 12 at 2:00PM
	Can you post a code sample. PostScript and PDF scale the image to the required size so the resolution will change. This is how it is designed to work. What exactly are you trying to acheive ? smaller filesize ? Andrew.

alinux Members Profile Find Members Posts Team Player Joined: 09 Dec 08 Location: France Status: Offline Points: 20	Post Options Post Reply Quote alinux Report Post Thanks(0) Quote Reply Posted: 07 Jun 12 at 5:17PM
	Hi Andrew, I'd like only to draw an image (a logo for example) into a PDF. As result I have a "pixelated" image into the pdf. I only load image from resources file (c# .Net) and use drawimage function. Same result with drawscaledimage function (scale level = 1): MemoryStream ms = new MemoryStream(); Image img = ProjectName.ResourceFile.bpo_logo; img.Save(ms, ImageFormat.Jpeg); qp.AddImageFromVariant(ms.ToArray(), 0); qp.SelectImage(qp.GetImageID(1)); qp.DrawImage(30, 30, qp.ImageWidth(), qp.ImageHeight()); I have the same result with all image formats (BMP, TIF, GIF, JPG, PNG). alinux
	alinux

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 08 Jun 12 at 11:53AM
	ImageWidth and ImageHeight return a value in pixels so you cannot use this pixel value directly in DrawImage as it require a location in points (72 points = 1 inch) Here is some code that will do what you need. QP.SetMeasurementUnits(0); int dpix = QP.ImageHorizontalResolution(); int dpiy = QP.ImageVerticalResolution(); if (dpix == 0) dpix = 72; if (dpiy == 0) dpiy = 72; int xx = QP.ImageWidth(); int yy = QP.ImageHeight(); double ImageWidthInPoints = (double)QP.ImageWidth() / dpix * 72.0; // assumming dpi units double ImageHeightInPoints = (double)QP.ImageHeight() / dpiy * 72.0; QP.DrawImage(0, 0, ImageWidthInPoints, ImageHeightInPoints); Andrew.

alinux Members Profile Find Members Posts Team Player Joined: 09 Dec 08 Location: France Status: Offline Points: 20	Post Options Post Reply Quote alinux Report Post Thanks(0) Quote Reply Posted: 11 Jun 12 at 7:50PM
	Mea culpa. Thank you Andrew for your explanation and your time. alinux
	alinux

Autodidact Members Profile Find Members Posts Team Player Joined: 03 Feb 06 Status: Offline Points: 21	Post Options Post Reply Quote Autodidact Report Post Thanks(0) Quote Reply Posted: 11 Jun 12 at 10:22PM
	How about using vector-logos? If the logo don't have to be in bitmap, which it rarely should/do, you could have a crisp logo scaled to any size — with a very low disk footprint.
	Haakon 8o)